What is virtual log file (VLF) in transaction log file?

transaction-log brent-ozar-unlimited log-file-vlf sp-blitz

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sp_Blitz Result: High Virtual Log File (VLF) Count. VLF stands for Virtual Log File and the transaction log file is made up of one or more virtual log files. The number of virtual log files can grow based on the autogrowth settings for the log file and how often the active transactions are written to disk.
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